Rechargeable aqueous zinc-ion batteries have attracted extensive interest because of low cost and high safety.However,the relationship between structure change of cathode and the zinc ion storage mecha-nism is still complex and challenging.Herein,open-structured ferric vanadate(Fe2V4O13)has been devel-oped as cathode material for aqueous zinc-ion batteries.Intriguingly,two zinc ion storage mechanism can be observed simultaneously for the Fe2V4O13 electrode,i.e.,classical intercalation/deintercalation storage mechanism in the tunnel structure of Fe2V4O13,and reversible phase transformation from ferric vanadate to zinc vanadate,which is verified by combined studies using various in-situ and ex-situ techniques.As a result,the Fe2V4O13 cathode delivers a high discharge capacity of 380mAh/g at 0.2 A/g,and stable cyclic performance up to 1000 cycles at 10 A/g in the operating window of 0.2-1.6 V with 2mol/L Zn(CF3SO3)2 aqueous solution.Moreover,the assembled Fe2V4O13//Zn flexible quasi-solid-state battery also exhibits a relatively high mechanical strength and good cycling stability.The findings reveal a new perspective of zinc ion storage mechanism for Fe2V4O13,which may also be applicable to other vanadate cathodes,providing a new direction for the investigation and design of zinc-ion batteries.

Wang Yang;Wu Yang;Yongfeng Huang;Chengjun Xu;Liubing Dong;Xinwen Peng

State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China;Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China;College of Chemistry and Materials Science,Jinan University,Guangzhou 511443,China

中国化学快报（英文版）

[1]Wang Yang;Wu Yang;Yongfeng Huang;Chengjun Xu;Liubing Dong;Xinwen Peng-.Reversible aqueous zinc-ion battery based on ferric vanadate cathode)[J].中国化学快报（英文版）,2022(10):4628-4634

Fe2V4O13,380mAh

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